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Getting HD Voice on GSM/2G to work

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By DokiRenault, Junior Member on 16th December 2017, 04:52 PM
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When I'm calling someone and my phone switches from 3G to 2G due to better signal, the audio quality drops to standard quality, although my provider supports HD Voice on GSM as well.
My goal is to avoid this, by enabling the feature for GSM. The only problem is, I haven't found a way to do it, yet.

WB-AMR can be changed via the *#0011# Service-menu, but this only affects the UMTS setting not the GSM one.
WB-AMR can also be set by the CSC's customer.xml, but I can't seem to find a variable to do it for GSM.

My guess would be directly editing the modem and its variables via ADB, the file system or something like this, if that's possible.

Do you have an idea where to start?
 
 
22nd November 2018, 06:35 AM |#2  
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Quote:
Originally Posted by DokiRenault

When I'm calling someone and my phone switches from 3G to 2G due to better signal, the audio quality drops to standard quality, although my provider supports HD Voice on GSM as well.
My goal is to avoid this, by enabling the feature for GSM. The only problem is, I haven't found a way to do it, yet.

WB-AMR can be changed via the *#0011# Service-menu, but this only affects the UMTS setting not the GSM one.
WB-AMR can also be set by the CSC's customer.xml, but I can't seem to find a variable to do it for GSM.

My guess would be directly editing the modem and its variables via ADB, the file system or something like this, if that's possible.

Do you have an idea where to start?

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